OLIVE OILS AND HEALTH 152 Historically, the health benefits of olive oil were attributed primarily to its favorable fatty acid profile, particularly its high content of monounsaturated fats. However, recent research has emphasised the importance of minor bioactive compounds in EVOO -especially polyphenols, tocopherols, and carotenoids- which exhibit antimicrobial, antioxidant, and anti-inflammatory properties. These compounds have been shown to influence the composition and metabolic activity of the gut microbiota in ways that support metabolic health and weight regulation. Specifically, EVOO polyphenols appear to increase the relative abundance of Bacteroidetes and reduce the Firmicutes/Bacteroidetes ratio, a shift associated with lower obesity risk. Additionally, EVOO consumption has been linked to increased populations of beneficial bacteria such as Bifidobacteria and Lactobacillus, both of which are associated with improved metabolic profiles, reduced systemic inflammation, and lower risk of obesity and cardiovascular disease. One proposed mechanism underlying these benefits is the enhanced production of short-chain fatty acids -such as acetate, propionate, and butyrate- by gut microbes in response to polyphenols intake. Short-chain fatty acids play a critical role in regulating energy balance, promoting satiety, improving insulin sensitivity, and protecting against obesity-related inflammation. While these findings are promising, they are primarily derived from small-scale studies or animal models. To validate and extend these observations, large-scale, long-term randomised clinical trials are needed. Nevertheless, current evidence suggests that EVOO can beneficially shape the gut microbiota and may contribute to weight regulation and the prevention of obesity-related complications through microbial pathways (Figure 12.2). 12.5. Olive oil, obesity, and precision nutrition Individual responses to dietary, pharmacological, or lifestyle interventions -such as changes in body weight, lipid levels, or glucose metabolism- vary widely across the population. This inter-individual variability has catalysed the emergence of precision nutrition, an approach that aims to tailor dietary recommendations based on genetic, microbial, metabolic, and behavioural profiles to optimize health outcomes and prevent disease. Initially, the field of precision nutrition focused largely on genetic variability as a key determinant of differential dietary responses. Over the past three decades,
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